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I’m gonna shoot from the hip here. are the colors that
you have. two blacks,white and green? (kinda starts off sounding
like a joke)anyway Two blacks-sensor heater circuit. white-sensor wire
green-ground or earth.If you have a P0420 testing the O2 isn’t the way to go. If you have a scan tool that reads live data look at the O2 readings. The primary O2 should switch back and forth across .5v fairly rapidly, the secondary should stay fairly constant near .5v if things are working as they should. If the secondary O2 fluctuates like the primary O2 then the catalytic converter is not doing it’s job. You can also check the temperature of the cat at the inlet and outlet. If the cat is working properly it will be 100º hotter at the outlet than the inlet.
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